Vibration absorbing mounting



lg- 3, 1937.v w. J. MoRRlLl. 2,089,066

VIBRATION ABSORBING MOUNTING Filed NOV. 2l, 1955 Iwvetor: Wayne J. Morrill,

Patented Aug. 3, 1937 RATIN ABSURBENG MOUNG Wayne li. Morrill, Fort `tVayne, ind., assigner to General Electric Company, a corporation ci New Yorin Aslpplliication November 2l, 19%, Serial No. 5h96!) 5 @latina My invention relates to vibration absorbing mountings tor dynamo-electric machines, or the like.

it is an object of my invention to provide a 5 vibration absorbing mounting for a dynamoelectric machine, or the like, subjected to torsional oscillation or vibration during the normal operation thereof, which is rugged and compact in construction, which requires a minimum numio her oi parts, and which is economical to manufacture.

Further objects and advantages ci my invention will become apparent as the following description proceeds, and the features or" novelty l5 which characterize my invention will be pointed out with particuiarity in the claims annexed to and :forming a part oi this specication.

For a better understanding of my invention reference may be had to the accompanying drawing, in which Fig. l is a side elevation partu ly in section, along the line i-l in Fig. 2, of a dynamo-electric machine provided with a vibration absorbing mounting embodying my inventionn and Fig. 2 is an end elevation of the base 25 and vibration absorbing mounting shown in Fig. l., part ci the upper portion of the mounting being broken away in order to better illustrate the construction thereof.

Referring to the drawing, l have shown in Fig.

w l a dynamo-electric machine or motor it, which is mounted on a suitable vertical base or support il by a vibration absorbing mounting embodying my invention. The motor iii is provided with hubs it and i3 at the opposite ends thereof in which a rotatable driving shaft it is iournaled, the motor rotor being carried by this shaft. The motor it is ordinarily subjected to torsional vibration during the normal operation thereof by periodic variations in load imposed on the motor. Furthermore, if the motor is of the alternating current type, it will be subjected to such torsional vibration by the periodically varying character of the alternating current supplied thereto. The driving shaft I4 is arranged with the longitudinal axis thereof substantially coincident with the airis of torsional oscillation of the motor it.

The vibration absorbing mounting includes a rectangular supporting plate l5, which is pro- 50 vided with@ circular aperture i6 therein surrounding and arranged on the hub l2 of the motor. The supporting plate l5 is provided with an outwardly projecting flange I'I, which eX- tends entirely about the aperture I6 and closely 55 conforms to a reduced portion IB on the outer (Cl. Mdm-26) end ofthe hub i2. The'supporting plate i5 is arranged at substantially right angles with respect to the axis of the motor it. A pair of duplicate circular sheet metal face plates it are arranged on opposite sides thereof oi the supporting plate l5 and substantially parallel thereto. .Each of the face plates lil and the supporting plate it are provided with iour complementary arcuate indentations forming a series of recesses 2li and 2 l, respectively, therein having a vi/-shaped cross section and arranged concentricaliy with respect to the motor shaft it. .arcuate resilient members t2, preferably made of soft rubber or the like, are retained under compression between the adjacent faces oi the supporting plate it and the face plates i9 in the indentations it and ti formed therein. |'lhe face plates lil are firmly secured against the adjacent resilient members 22 and prevented from moving relative to each other by a series of hollow bushings or attaching members which clamp them together. The reduced portions Ztc of the bushings t6 are mounted in registering holes ld formed in the face plates i9 between the ends of the arcuate indentations or recesses 2t therein and the ends ci the bushings iii are peened over, so as to hold the face plates it rigidly in position. .The bushings 2li 'pass through suitable apertures 25 formed in the supporting plate it, the apertures t5 being of sufdcient size to permit relative movement between the supporting plate i5 and the iace plates it.

The supporting plate i6 oi the vibration absorbing mounting, described above, is preferably secured to the motor l0 by through-bolts 26, which also serve to hold the end shields 2l and 2t of the motor it in position. Spacing sleeves i9 surround the projecting ends of the throughbolts 26 and are secured between the supporting plate i5 and the adjacent end shield il of the motor it. The bolts 26 are secured to the corner portions la. of the supporting plate i6 beyond the edges of the face plates it. The face plates iii of the vibration absorbing mounting, described above, are secured to the mounting base il by a series of machine screws it, which engage suitable threads 3l formed in the interior of the bushings 23. The face plates lil are thus rigidly secured to the mounting base li land relative rotation therebetween-is prevented. It will be understood 'that the arrangement might be reversed and the supporting plate l5 secured to the base Il and the face plates I9 secured to the motor i0. The mounting base Il is provided with a series of holes 3| adjacent the corners thereof in which suitable bolts may be placed to secure the motor in position on the machine with which it is to be used.

During operation of the motor Iii, the mounting construction, described above. permits the motor Il) to oscillate, under the action of pulsating torque produced by the load, or pulsations in the torque of the motor, to a limited extent about an axis of torsional oscillation coincident with the axis of the driving shaft H. Such oscillation or vibration oi! the motor is taken up and limited bythe shear stress in the rubber members 22, the friction between the adjacent surlaces of the supporting plate i5 andthe face plates I8 and the rubber members 22. In this manner, torsional vibration of the motor is ab` sorbed by the mounting, and the torsional vibrationoi the motor is not, therefore, transmitted to the machine or structure on which the supporting plate Il is mounted. Radial or axial vibration or movement of the motor. I0 places the rubber members 22 under compression, so that a consequent saving in space is effected.

the amplitude of radial or axial movement of the motor i0 is limited toa relatively small amount both by the resistance ot the rubber to compression and by the indentations 20 and 2l. As a result the motor III is mounted so as to be rigid against belt pull and axial. displacement. lIt will thus be, seen that the rubber members 22 are utilized to minimize vibratory movement of the motor i0 in all directions and, consequently, the amount of force transmitted to the base Il, due to vibratory movement of the motor I0, is also minimized. The arrangement o!` .the complementary indentations or recesses 20 and 2| in the face plates I8 and supporting plate I5, described above, limits the radial displacement oi' the motor lil and serves to hold the resilient members 22 iirmly in position.

It will be seen that I have provided a vibration absorbing mounting which may be constructed from inexpensive sheet metal parts. Due to the compactness of the mounting. which I have provided, and also its relative arrangement with respect to the motor the overall length oi' the motor is not increased by the mounting and Moreover, it will be noted that my improved mounting may be applied to a standard motor without altering the construction thereof or providing special attachment projections on the motor frame.

Although I have shown a particular embodiment of my invention in connection with an electric motor, I do not desire my invention to be limited to the particular construction shown and described and I intend, in the appended claims, to cover all modiilcations within the spirit and scope of my. invention. y

What I claim as new and desire to secure b Letters Patent of the United States is: l

*1. A vibration absorbing mounting Vfor securing to a support a dynamo-electric machine or the like subjected to torsional oscillation during the normal operation thereof comprising a supporting plate adaptedto be arranged transversely of the axis of oscillatory movement of the machine, face plates arranged on opposite sides of said supporting plate, Veach o! said plates having complementary arcuate recesses therein, said recesses having a. substantially V-shaped crosssection, arcuate resilient members positioned in Psaid recesses between the adjacent faces of said plates, means for retaining said resilient memhers under compression between said plates. and

aosaooa means for securing at least one oi' said plates to the machine and for securing at least one of the other of said plates to the support.

2. In combination a dynamo-electric machine or the like subjected to torsional oscillation during the normal operation thereof having hubs thereon and' a shaft journaled in said hubs, said shaft being arranged with the axis thereof substantially coincident with the axis of oscillation of saidy machine, a vibration absorbing mounting for said machine comprising a supporting plate having an aperture therein extending about said shaft and arranged on one of said hubs, face plates arranged on opposite sides of said supporting plate and having apertures therein through which said shaft extends, at least one oi said plates having indentations formed therein, resilient members positioned between the ad` jacent faces of said plates and in said indentations, means for retaining said resilient members under compression between said plates, means for securing said supporting plate to said machine, and means for securing said face plates to a support.

3..In combination a dynamo-electric machine or the like subjected to torsional oscillation during the normal operation thereof having hubs formed thereon and a driving shaft journaled lin said hubs, a vibration absorbing mounting for Asaid machine comprising asupporting plate having an aperture therein through which said shaft extends and arranged on one oi said hubs, face plates arranged on opposite sides of said supporting plate and having apertures therein through which said last-mentioned hub extends, each of said plates having complementary arcuate indentations formed therein and arranged in substantially concentric relation with said shaft, said indentations having a substantially V-shaped cross-section, arcuate resilient members posi- *tionen in said indentations between the adjacent faces of said plates, means for retaining said resilient `members in compression between said plates, means for securing said supporting plate to said machine, and means for securing said face plates to a support.

4. In combination a dynamo-electric machine yor the like subjected to torsional oscillation during the normal operation thereof having hubs formed thereon and a driving shaft journaled in said hubs, a vibration absorbing mounting for said machine comprising a supporting plate having an aperture therein through which said shaft extends and arranged on one oi.' said hubs, face plates arranged on opposite sides of said supporting plate and having apertures therein through which said one oi said hubs extends, each of said plates having complementary arcuate indentations formed therein and arranged in substantially concentric relationv with said shaft, said indentationshaving a substantially V-shaped cross-section, arcuate resilient members positioned in said indentations between the adjacent faces of said plates, said supporting plate having a series of apertures formed therein and arranged about said first-mentioned aperture therein, means including attaching members located in said last-mentioned apertures in said supporting -plate for retaining said resilient members in compression between said plates and for preventing relative movement between said face plates, means for securing said supporting plate to said machine. and means for securing said face plates to a support. l

5. In combination a dynamo-electric machine ranged in substantially concentric relation with said shaft, said indentations having a substan- 2,089,068 Aor the like subjected to torsional oscillation durtially V-shaped .cross-section. arcuate resilient members positioned in said indentations between the adjacent laces of said plates, said supporting plate having a series oi' apertures formed therein and arranged about said first-mentioned aperture therein, means including attaching members located in said last-mentioned apertures in said supporting plate for retaining said resilient members in compression between said plates and lfor preventing relative movement between said face plates, means including extensions on said supporting plate and cooperating with said bolts for securing said supporting plate to said machine, and means for securing said faceplates to a support.

WAYNE J. MORRILL. 

